发布于 2018-03-08 23:58:45 | 166 次阅读 | 评论: 0 | 来源: 网友投递
Spring Framework 开源j2ee框架
Spring是什么呢?首先它是一个开源的项目,而且目前非常活跃;它是一个基于IOC和AOP的构架多层j2ee系统的框架,但它不强迫你必须在每一层 中必须使用Spring,因为它模块化的很好,允许你根据自己的需要选择使用它的某一个模块;它实现了很优雅的MVC,对不同的数据访问技术提供了统一的接口,采用IOC使得可以很容易的实现bean的装配,提供了简洁的AOP并据此实现Transcation Managment,等等
spring security用了也有一段时间了,弄过异步和多数据源登录,也看过一点源码,最近弄rest,然后顺便搭oauth2,前端用json来登录,没想到spring security默认居然不能获取request中的json数据,谷歌一波后只在stackoverflow找到一个回答比较靠谱,还是得要重写filter,于是在这里填一波坑。
准备工作
基本的spring security配置就不说了,网上一堆例子,只要弄到普通的表单登录和自定义UserDetailsService就可以。因为需要重写Filter,所以需要对spring security的工作流程有一定的了解,这里简单说一下spring security的原理。
spring security 是基于javax.servlet.Filter的,因此才能在spring mvc(DispatcherServlet基于Servlet)前起作用。
看UsernamePasswordAuthenticationFilter源码里的obtainUsername和obtainPassword方法只是简单地调用request.getParameter方法,因此如果用json发送用户名和密码会导致DaoAuthenticationProvider检查密码时为空,抛出BadCredentialsException。
/**
* Enables subclasses to override the composition of the password, such as by
* including additional values and a separator.
* <p>
* This might be used for example if a postcode/zipcode was required in addition to
* the password. A delimiter such as a pipe (|) should be used to separate the
* password and extended value(s). The <code>AuthenticationDao</code> will need to
* generate the expected password in a corresponding manner.
* </p>
*
* @param request so that request attributes can be retrieved
*
* @return the password that will be presented in the <code>Authentication</code>
* request token to the <code>AuthenticationManager</code>
*/
protected String obtainPassword(HttpServletRequest request) {
return request.getParameter(passwordParameter);
}
/**
* Enables subclasses to override the composition of the username, such as by
* including additional values and a separator.
*
* @param request so that request attributes can be retrieved
*
* @return the username that will be presented in the <code>Authentication</code>
* request token to the <code>AuthenticationManager</code>
*/
protected String obtainUsername(HttpServletRequest request) {
return request.getParameter(usernameParameter);
}
重写UsernamePasswordAnthenticationFilter
上面UsernamePasswordAnthenticationFilter的obtainUsername和obtainPassword方法的注释已经说了,可以让子类来自定义用户名和密码的获取工作。但是我们不打算重写这两个方法,而是重写它们的调用者attemptAuthentication方法,因为json反序列化毕竟有一定消耗,不会反序列化两次,只需要在重写的attemptAuthentication方法中检查是否json登录,然后直接反序列化返回Authentication对象即可。这样我们没有破坏原有的获取流程,还是可以重用父类原有的attemptAuthentication方法来处理表单登录。
/**
* AuthenticationFilter that supports rest login(json login) and form login.
* @author chenhuanming
*/
public class CustomAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
@Override
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
//attempt Authentication when Content-Type is json
if(request.getContentType().equals(MediaType.APPLICATION_JSON_UTF8_VALUE)
||request.getContentType().equals(MediaType.APPLICATION_JSON_VALUE)){
//use jackson to deserialize json
ObjectMapper mapper = new ObjectMapper();
UsernamePasswordAuthenticationToken authRequest = null;
try (InputStream is = request.getInputStream()){
AuthenticationBean authenticationBean = mapper.readValue(is,AuthenticationBean.class);
authRequest = new UsernamePasswordAuthenticationToken(
authenticationBean.getUsername(), authenticationBean.getPassword());
}catch (IOException e) {
e.printStackTrace();
new UsernamePasswordAuthenticationToken(
"", "");
}finally {
setDetails(request, authRequest);
return this.getAuthenticationManager().authenticate(authRequest);
}
}
//transmit it to UsernamePasswordAuthenticationFilter
else {
return super.attemptAuthentication(request, response);
}
}
}
封装的AuthenticationBean类,用了lombok简化代码(lombok帮我们写getter和setter方法而已)
@Getter
@Setter
public class AuthenticationBean {
private String username;
private String password;
}
WebSecurityConfigurerAdapter配置
重写Filter不是问题,主要是怎么把这个Filter加到spring security的众多filter里面。
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.cors().and()
.antMatcher("/**").authorizeRequests()
.antMatchers("/", "/login**").permitAll()
.anyRequest().authenticated()
//这里必须要写formLogin(),不然原有的UsernamePasswordAuthenticationFilter不会出现,也就无法配置我们重新的UsernamePasswordAuthenticationFilter
.and().formLogin().loginPage("/")
.and().csrf().disable();
//用重写的Filter替换掉原有的UsernamePasswordAuthenticationFilter
http.addFilterAt(customAuthenticationFilter(),
UsernamePasswordAuthenticationFilter.class);
}
//注册自定义的UsernamePasswordAuthenticationFilter
@Bean
CustomAuthenticationFilter customAuthenticationFilter() throws Exception {
CustomAuthenticationFilter filter = new CustomAuthenticationFilter();
filter.setAuthenticationSuccessHandler(new SuccessHandler());
filter.setAuthenticationFailureHandler(new FailureHandler());
filter.setFilterProcessesUrl("/login/self");
//这句很关键,重用WebSecurityConfigurerAdapter配置的AuthenticationManager,不然要自己组装AuthenticationManager
filter.setAuthenticationManager(authenticationManagerBean());
return filter;
}
题外话,如果搭自己的oauth2的server,需要让spring security oauth2共享同一个AuthenticationManager(源码的解释是这样写可以暴露出这个AuthenticationManager,也就是注册到spring ioc)
@Override
@Bean // share AuthenticationManager for web and oauth
public AuthenticationManager authenticationManagerBean() throws Exception {
return super.authenticationManagerBean();
}
至此,spring security就支持表单登录和异步json登录了。
参考来源
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持PHPERZ。